Propeller



a. A. o'emsszx.

PROPELLER. APPLICATION FILED '1uLY23. 1919.

Patented Aug. 1, 1922.

WITNESSES I nr roimrs entree snare ant @ECCE,

GEQRGE A.OGRISSEK, 0F JERSEY @ITY, NEW 5 2"? PROEELLER.

insects,

Application filed July 23,

T 0 all whom it may concern:

Be it known that I, GEORGE A. OoRIssnK, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State-of New Jersey, have invented a new and useful Propeller, of which the following is a full, clear, and exact description.

This invention relates to propellers and has for an object the provision of an improved construction wherein efficient results are secured either in the air or in water.

Another object of the invention is to provide a propeller in which the blade has a radual change of angle of pitch throughout its length whereby produced. a

A further object of the invention is to pro.- vide a construction in which vibration is eliminated by reason of the angle of incidence and the arrangement of their inner and outer rims, or both inner and outer rims assuring the correct position of the respective blades.

An additional object is to provide a propeller in which the blades may be formed somewhat corrugated or ribbed for engaging in a better manner the air or water as the propeller is'rotated...

In the accompanying drawings:

Figure 1 is an elevation of a propeller disclosing an embodiment of the invention.

.Figure 2 is a view similar to Figure l, but showing-an outer rim connected to the outer ends of the respective propeller blades.

Figure 3 is a fragmentary side view of one of the propeller blades showing a ribbed construction, embodying certain features of an'even pull or push is the invention.

suitable manner.

Figure 4 is a fragmentary sectional'view through Figure 3 on line H.

Figure 5 is a view similar to Figurefi,

but showing a slightly modified construction involving the corrugation of part of the blade.

Figure 6 is a fragmentary sectional view through Figure 5 on line 6-6.. 4

Fig. 7 is a fragmentary view indicating a cross section'ot the blade d-through Fig. 2,

p to line '?-7.

Referring to the accompanying drawing by numerals, 1 indicates a ring which may be 'of any desired size to which the outer. ends of the inner blades 2 are secured in any The inner ends of blades 2 are secu ed in a sui ab e b 3 h ch' may Specification of Letters Patent.

' of the Patented sa a, tees, 191a Serial no. 312,656.

be arranged to be secured to the shaft of a ship or to the. shaft of an engine used on an airship. Secured to the ring 1 by bolts,

or otherwise, are a plurality of outer blades 4, said blades being preferably arranged to extend'radially from a point substantially half way between the respective blades 2. It will be observed that all of these blades are twisted uniformly from one end to the other so as to give an even pull without vibration.- It will be noted that the angle of incidence adjacent the hub is greater than at the outer or ti end of the blades because of the difference in speed between the inner and outer ends of the blade. To'more thoroughly realize .or secure the effect of no vibration or little vibration an outer rim or band 5 may be secured to the blades 4 as shown in Figure 2, so that an inner and outer rim, said rims rim 5 also acts as means for preventing any one from being accidentally struck by the blades a as well'as acts venting any article from entering the blade space laterally.

When water or air, as the case may be, is engaged at the front of the blade and forced rear- 88? wardly so as to give I stead of causing an agitation of the water a maximum push inand forcing the same laterally or substantially radially of the blades.

In Figures 3 form of the invention is shown which is intended to augment, and in different ways, assist the blades 4: ingiving a thrust. The blade 6 shown in Figure 3 is constructed substantially as blade 4 shown in Figure 1, Mt

except that a plurality of outstanding beads or webs are provided, sald webs being arcshaped, the center of the are being the center of the propeller. This arrangement retains the air or water against the blade surface ice so thatit must pass from the front to the. rear of the blade surface instead of passing in a radial direction? whereby the maximum y pulling or pushing edect is secured,

I igures5 and -6-'a slightly modified the structure to that shown in Figure 3 1s presented wherein the blad 8 is provided witha number of corrugations or raised portions 9, said corrugations being concentric with the rim 1.

structure shown in Figure 4 as it causes the Weiss? 9! air engaging the blade there will be being of a width equal to the blades; The outer as means for prethe propeller isbeing used the and 4 a slightly modified The action here is similar to that forward edges to follow the curve of the corrugations 9 and thereby permits the propeller to act against the water or air for producing the thrust desired.

The inner blades 2, as shown in Figures 1 and 2, are the same width throughout and also are made of Wood, though they may be formed of metal without departin from the spirit of the invention. Prefera ly the rings 1 and 5 are metal so as to secure the proper strength without presenting an objeotionably thick construction. It will also be noted that the outer blades are bolted or otherwise removably secured to the inner ring 1 so that in case any of the outer blades should become broken or injured that par ticular blade may be removed and a new one substituted quickl and easily. The blades 4 are preferably bolted rigidly in place at the desired angle, though if preferred the openings in the rim 1 may be elongated so as to vary'the angle of incidence if desired.

What I claim 1s:

1. A propeller comprising a hub, an inner series of radiating fiat blades substantially the same width throughout extending from said hub,'a ring secured to the outer ends of said blades, and an outer series of flat blades extending radially from said ring, said last mentioned blades having straight and convexly curved rear edges, said curved edges approaching said straight edges toward the outer ends thereof.

2. A propeller comprising a hub, an inner series of radiating fiat blades substantially the same width throughout extending froin 7 said hubi a ring secured to the outer ends of said bla es, and an outer series of fiat blades extending radially from said ring equidistantly between the inner series of blades,

said outer series of blades having flanges secured to the ring, and an outer rim connecting the outer series of blades and the extremities thereof, said ring and rim being of a width equal to the width of the blades, said last mentioned blades having straight forward edges and convexly curved rear edges, said curved edges approaching said straight edges from a medial point to the.

Ward edges and curved rear edges, said rear edges being concaved at their inner portions and convex at their outer portions and the blades being tapered slightly toward their 7 free ends.

4. A propeller comprising a hub, an inner series of radiatingflat blades substantially the same width throughout extending from said hub, a ring secured to the outer ends of said blades, and an outer series of flat blades extending radially from said ring, blades being of less Width at their outer ends than at their inner ends, said last mensome blades having straight forward edges and curved rear edges, said rear edges being concaved at their inner portions and convex at their outer portions and the blades being tapered slightly toward their free ends, said edges being of compound curvature, and said outer blades being corrugated so as to present passageways extending from the front .edge to the rear edge of therespective blades and concentric with the center of the poses specified.

said outer GEORGE A. OGRISSEK. 

